The heart of the SPIRA FOOTWEAR product line are the patented spiral WaveSprings® imbedded in the soles of the shoes.  These springs capture the compressive energy imposed into them with each step you take and then return more than 90% of that energy back into your leg when you lift your foot.  The result is less fatigue and more energy in your every step !  And the wide cross-section of the spiral WaveSpring (tm) provides for terrific lateral stability. SPIRA® walking shoes are designed with spiral WaveSprings® in different sizes - one larger one under the heel and two smaller ones under the forefoot.  The result is a comfortable cushioned shoe that you can wear all day.

     For Runner's, the new SPIRA Stinger XLT running shoe features s similar triple WaveSpring® configuration for maximum comfort, stability and energy return.